caterpillar vs mantis

caterpillar

noun
  • The larva of a butterfly or moth; leafworm 

  • A vehicle with a caterpillar track; a crawler 

  • A set of subtrees of a tree 

mantis

noun
  • Any of various large insects of the order Mantodea that catch insects or other small animals with their powerful forelegs. 

  • A green colour, like that of many mantises. 

How often have the words caterpillar and mantis occurred in a corpus of books? (source: Google Ngram Viewer )